The dust to gas ratio and internal extinction in planetary nebulae

Details The dust to gas ratio and internal extinction in planetary nebulae The dust to gas ratio and internal extinction in planetary nebulae

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....56..189k&link_type=abstract

Astronomy and Astrophysics, vol. 56, no. 1-2, Apr. 1977, p. 189-192.

Astronomy and Astrophysics

Astrophysics

18

Cosmic Dust, Interstellar Extinction, Interstellar Gas, Mass Ratios, Optical Thickness, Planetary Nebulae, Continuous Radiation, Infrared Radiation, Interstellar Matter, Ionized Gases, Radiant Flux Density

Scientific paper

Measures of dust content and internal extinction are derived for 21 planetary nebulae. The dust to gas ratio varies considerably (2 decades) among individual nebulae, though a correlation with nebula age could not be found. Six nebulae are shown to have relatively large internal extinction, whereas most nebulae are found to have very small dust optical depths. This indicates that the effects of dust on the ionization structure will barely be perceptible in many planetary nebulae.

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